Security readout for executives and security teams
Plain-English summary
A low-privileged user on a NuCom 11N Wireless Router running firmware 5.07.90 can access the configuration backup function and recover the administrator password. This can turn limited access into full router control, affecting network availability, traffic handling, and device settings.
Executive priority
Treat as high priority for environments using this router model. The issue can expose administrator credentials and enable full device takeover by a low-privileged user. Prioritize management interface restriction, asset identification, and vendor update checks.
Technical view
CVE-2021-47726 is a CWE-522 credential exposure issue in the configuration backup endpoint. The public advisories describe retrieval of administrative credentials by an authenticated non-admin user using a crafted HTTP request and cookie, with the password recoverable from Base64-encoded configuration data. CVSS v4.0 is 8.7 high.
Likely exposure
Exposure is limited to NuCom 11N Wireless Router firmware 5.07.90, especially where the web management interface is reachable by untrusted or low-privileged users. Internet exposure would increase risk, but the sources do not quantify prevalence.
Exploitation context
A public ExploitDB entry exists, so technical details are publicly available. The provided sources do not show CISA KEV listing or confirmed active exploitation. Exploitation requires low privileges, no user interaction, and network access to the router management interface.
Researcher notes
Evidence is based on CVE metadata, VulnCheck, Zero Science Lab, and ExploitDB references. The bundle does not name a fixed firmware version or vendor patch. Avoid assuming broader NuCom products are affected beyond NuCom 11N Wireless Router 5.07.90.
Mitigation direction
- Identify NuCom 11N Wireless Router devices and confirm firmware version 5.07.90.
- Restrict router management access to trusted administrative networks only.
- Remove or disable unnecessary low-privileged accounts where operationally possible.
- Check NuCom guidance for firmware updates or vendor-recommended remediation.
- Rotate router administrator credentials after remediation or exposure concerns.
Validation and detection
- Inventory routers by model and firmware version.
- Verify whether the web management interface is reachable from untrusted networks.
- Review user accounts with non-administrative access to router management.
- Check logs for unusual configuration backup access, if available.
- Confirm vendor advisory or firmware status before closing remediation.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-522: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-47726 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.7 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
8.7HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-49634CVE reference · exploit
- NuCom Vendor HomepageCVE reference · product
- Zero Science Lab Disclosure (ZSL-2021-5629)CVE reference · third-party-advisory
- VulnCheck Advisory: NuCom 11N Wireless Router 5.07.90 Privilege Escalation via Configuration BackupCVE reference · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Insufficiently Protected Credentials
Insufficiently Protected Credentials represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.